Variability of Electrode Positions Using Electrode Caps

Atcherson, Samuel R.; Gould, Herbert Jay; Pousson, Monique; Prout, Tina M.

doi:10.1007/s10548-007-0036-z

Cited by 21 publications

(17 citation statements)

References 9 publications

(16 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A standard EEG cap is manufactured according to the International 10/20 system. Considering the uncertainty of manual operation, when the cap is put on the head of a subject, the position of each hole is expected to be offset from the corresponding 10/20 landmark with a random error of about 0–13 mm (Atcherson et al, 2007 ). Therefore, we simulated the manually sampled point set in two steps (Figure 6 ).…”

Section: Experiments and Resultsmentioning

confidence: 99%

Semi-automatic 10/20 Identification Method for MRI-Free Probe Placement in Transcranial Brain Mapping Techniques

et al. 2017

View full text Add to dashboard Cite

The International 10/20 system is an important head-surface-based positioning system for transcranial brain mapping techniques, e.g., fNIRS and TMS. As guidance for probe placement, the 10/20 system permits both proper ROI coverage and spatial consistency among multiple subjects and experiments in a MRI-free context. However, the traditional manual approach to the identification of 10/20 landmarks faces problems in reliability and time cost. In this study, we propose a semi-automatic method to address these problems. First, a novel head surface reconstruction algorithm reconstructs head geometry from a set of points uniformly and sparsely sampled on the subject's head. Second, virtual 10/20 landmarks are determined on the reconstructed head surface in computational space. Finally, a visually-guided real-time navigation system guides the experimenter to each of the identified 10/20 landmarks on the physical head of the subject. Compared with the traditional manual approach, our proposed method provides a significant improvement both in reliability and time cost and thus could contribute to improving both the effectiveness and efficiency of 10/20-guided MRI-free probe placement.

show abstract

Section: Experiments and Resultsmentioning

confidence: 99%

Semi-automatic 10/20 Identification Method for MRI-Free Probe Placement in Transcranial Brain Mapping Techniques

et al. 2017

View full text Add to dashboard Cite

show abstract

“…The results from our proposed NIRS-EEG probe also compare favorably to the precision error reported in studies evaluating a NeuroMedical cap (Compumedics USA, El Paso, Texas), which ranged from 3.0 to 12.7 mm. 39 Studies of the projection of the 10-10 positions onto the brain show a standard deviation of 4.6 mm in x, 7.1 mm in y and 7.8 mm in z, 55 which is larger than the error introduced by our NIRS-EEG head probe.…”

Section: Discussionmentioning

confidence: 75%

“…Placing electrodes using caps has been shown to cause significant electrode positional error, making them an inappropriate method when accuracy is necessary. 39 In this work we aim to demonstrate that our NIRS-EEG head probe can be used to accurately and precisely place electrodes.…”

Section: Sensor Locationmentioning

confidence: 99%

Compliant head probe for positioning electroencephalography electrodes and near-infrared spectroscopy optodes

Giacometti

Diamond

2013

J. Biomed. Opt

View full text Add to dashboard Cite

Abstract. A noninvasive head probe that combines near-infrared spectroscopy (NIRS) and electroencephalography (EEG) for simultaneous measurement of neural dynamics and hemodynamics in the brain is presented. It is composed of a compliant expandable mechanism that accommodates a wide range of head size variation and an elastomeric web that maintains uniform sensor contact pressure on the scalp as the mechanism expands and contracts. The design is intended to help maximize optical and electrical coupling and to maintain stability during head movement. Positioning electrodes at the inion, nasion, central, and preauricular fiducial locations mechanically shapes the probe to place 64 NIRS optodes and 65 EEG electrodes following the 10-5 scalp coordinates. The placement accuracy, precision, and scalp pressure uniformity of the sensors are evaluated. A root-mean-squared (RMS) positional precision of 0.89 AE 0.23 mm, percent arc subdivision RMS accuracy of 0.19 AE 0.15%, and mean normal force on the scalp of 2.28 AE 0.88 N at 5 mm displacement were found. Geometric measurements indicate that the probe will accommodate the full range of adult head sizes. The placement accuracy, precision, and uniformity of sensor contact pressure of the proposed head probe are important determinants of data quality in noninvasive brain monitoring with simultaneous NIRS-EEG.

show abstract

“…The electrode placement for EEG was done in accordance to the international federation in electroencephalography and clinical neurophysiology as a 10-20 electrode placement system. 13 14 EEG recordings were obtained in two settings: before chewing paraffin gum (Saliva-Check kit, GC Corporation, Japan) and after three minutes of chewing gum with one-minute resting intervals between each EEG recording. The recordings were made for the total of fifteen minutes.…”

Section: Methodsmentioning

confidence: 99%

Power spectrum density analysis for the influence of complete denture on the brain function of edentulous patients - pilot study

et al. 2016

View full text Add to dashboard Cite

PURPOSEThis pilot study was to find the influence of complete denture on the brain activity and cognitive function of edentulous patients measured through Electroencephalogram (EEG) signals.MATERIALS AND METHODSThe study recruited 20 patients aged from 50 to 60 years requiring complete dentures with inclusion and exclusion criteria. The brain function and cognitive function were analyzed with a mental state questionnaire and a 15-minute analysis of power spectral density of EEG alpha waves. The analysis included edentulous phase and post denture insertion adaptive phase, each done before and after chewing. The results obtained were statistically evaluated.RESULTSPower Spectral Density (PSD) values increased from edentulous phase to post denture insertion adaption phase. The data were grouped as edentulous phase before chewing (EEG p1-0.0064), edentulous phase after chewing (EEG p2-0.0073), post denture insertion adaptive phase before chewing (EEG p3-0.0077), and post denture insertion adaptive phase after chewing (EEG p4-0.0096). The acquired values were statistically analyzed using paired t-test, which showed statistically significant results (P<.05).CONCLUSIONThis pilot study showed functional improvement in brain function of edentulous patients with complete dentures rehabilitation.

show abstract

Variability of Electrode Positions Using Electrode Caps

Cited by 21 publications

References 9 publications

Semi-automatic 10/20 Identification Method for MRI-Free Probe Placement in Transcranial Brain Mapping Techniques

Semi-automatic 10/20 Identification Method for MRI-Free Probe Placement in Transcranial Brain Mapping Techniques

Compliant head probe for positioning electroencephalography electrodes and near-infrared spectroscopy optodes

Power spectrum density analysis for the influence of complete denture on the brain function of edentulous patients - pilot study

Contact Info

Product

Resources

About